It works the other way around. I used to have a steel KJ wheel as my spare, and it fit perfectly on my KK (although it looked pretty ugly when I needed to use it!). I found a matching 5th KK wheel at a junkyard recently, so I now have a matching spare for my '08.
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997